12506321 has 4 divisors (see below), whose sum is σ = 12529332. Its totient is φ = 12483312.

The previous prime is 12506311. The next prime is 12506323. The reversal of 12506321 is 12360521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12360521 = 449 ⋅27529.

It can be written as a sum of positive squares in 2 ways, for example, as 1210000 + 11296321 = 1100^2 + 3361^2 .

It is a cyclic number.

It is not a de Polignac number, because 12506321 - 2⁶ = 12506257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12506293 and 12506302.

It is not an unprimeable number, because it can be changed into a prime (12506323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10670 + ... + 11783.

It is an arithmetic number, because the mean of its divisors is an integer number (3132333).

Almost surely, 2^12506321 is an apocalyptic number.

It is an amenable number.

12506321 is a deficient number, since it is larger than the sum of its proper divisors (23011).

12506321 is an equidigital number, since it uses as much as digits as its factorization.

12506321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23010.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 12506321 is about 3536.4277173442. The cubic root of 12506321 is about 232.1185543992.

Adding to 12506321 its reverse (12360521), we get a palindrome (24866842).

The spelling of 12506321 in words is "twelve million, five hundred six thousand, three hundred twenty-one".